Diffusion and Factors Affecting Its Rate

Vocabulary flashcards covering the definition of diffusion, examples of molecules that diffuse in and out of cells, and factors that affect the rate of diffusion.

Diffusion

The spreading out of particles resulting in a net movement from an area of higher concentration to an area of lower concentration.

Net

Overall.

Oxygen

A molecule needed by cells for respiration in mitochondria that diffuses into cells from a higher concentration in the bloodstream.

Carbon dioxide

A waste gas produced by respiration inside cells that diffuses out of the cell into an area of lower concentration.

Urea

A waste product produced inside cells that diffuses out of cells into the blood plasma and is excreted by the kidneys.

Concentration gradient

The difference in concentration between two areas; the greater the concentration gradient, the faster diffusion takes place.

Temperature

A factor affecting diffusion where a higher temperature increases the rate of diffusion because particles have more kinetic energy and move faster.

Surface area of the membrane

A factor affecting diffusion where a larger surface area of the cell membrane results in a greater rate of diffusion.